摘要
为研究钢轨闪光对焊闪光阶段的温度场分布,建立了三维实体有限元模型.计算过程中考虑了温度对材料相变和热物理特性的影响,运用"生死"单元技术解决闪光时液体过梁爆破引起物质烧损的模拟问题,同时采用红外电视图像测温法实时测量闪光阶段温度场分布.结果表明,有限元分析结果与实验结果十分吻合,为选择和优化闪光焊焊接参数提供了重要的手段,为后续闪光焊过程顶锻阶段热力耦合过程的模拟奠定了基础.
A 3D finite element model was built to simulate the temperature field distribution in flashing process of flashing butt welding of rail. During the calculation, enthalpy and temperature dependence of material properties were taken into consideration, and the simulation of materials burning off at flashing process was resolved by birth and death capability of element. At the same time, temperature field distribution in flashing process of flashing butt welding of rail was measured by infrared thermoscope. The experimental result shows that the model prediction agrees well with the practice, which provides a useful tool for selection and optimization of flash butt welding parameters and also provides a basis for analyzing thermodynamical coupling in the upset process of flash butt welding.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2008年第5期778-781,共4页
Journal of Shanghai Jiaotong University
关键词
钢轨焊接
闪光焊
有限元
分析建模
温度场
rail welding
flash welding
finite element analysis
analysis and modeling
temperature field
